WO2016074529A1 - 一种介质访问控制转发链路切换方法及装置 - Google Patents

一种介质访问控制转发链路切换方法及装置 Download PDF

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WO2016074529A1
WO2016074529A1 PCT/CN2015/089459 CN2015089459W WO2016074529A1 WO 2016074529 A1 WO2016074529 A1 WO 2016074529A1 CN 2015089459 W CN2015089459 W CN 2015089459W WO 2016074529 A1 WO2016074529 A1 WO 2016074529A1
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mac
frr
link
outbound interface
access control
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PCT/CN2015/089459
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French (fr)
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钱学强
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming

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  • This document refers to, but not limited to, data communication technology, especially in Virtual Private LAN Service (VPLS), PseudoWire (PW) Fast Reroute (FRR), Media Access Control (MAC). ) Forward link switching method and device.
  • VPLS Virtual Private LAN Service
  • PW PseudoWire
  • FRR Fast Reroute
  • MAC Media Access Control
  • VPLS is actually a Layer 2 VPN service based on Multiprotocol Label Switching (MPLS) network, namely MPLS L2VPN technology.
  • MPLS technology is used on the carrier network to connect users dispersed in different geographical locations. . From the user's point of view, the entire MPLS network is transparent, just like a virtual Layer 2 switching network.
  • Figure 1 shows a typical VPLS PW FRR service network.
  • the user facing-Provider Edge (UPE), the network provider network equipment (NPE) 1, the NPE2, and the NPE3 form a carrier network, and the user border network equipment (Custom) Edge, CE)1 and CE2 provide VPLS services.
  • a PW full connection needs to be established between the NPEs.
  • the PW between the NPEs is referred to herein as NPW (a pseudowire between network-oriented carrier network devices).
  • UPE1 establishes UPW (pseudowire between carrier-oriented carrier network devices) 1, UPW2, and forms PW FRR on UPE1, respectively.
  • UPW1 is the primary link and UPW2 is the backup link.
  • CE1 and CE2 are connected to the carrier network through the AC (Access Connection).
  • CE1 sends a packet to CE1 (the source MAC address of the packet is MAC2 and the destination MAC address is MAC1).
  • the packet is received from both UPW1 and UPW2.
  • UPW2 is the backup link, so packets are discarded.
  • the UPW1 is the primary link, and the packets are processed and forwarded to CE1 through AC1.
  • UPE1 learns MAC2 and the outgoing interface is UPW1.
  • the packet sent by CE1 to CE2 (the source MAC address is MAC1 and the destination MAC address is MAC2), and the MAC2 is queried in UPE1.
  • the outbound interface is UPW1, so it is forwarded through UPW1.
  • the VPLS service When the primary link UPW1 on the UPE1 fails, the VPLS service will switch the UPW2 to the primary link. At the same time, due to the failure of UPW1, the MAC1 learned on it will be deleted.
  • the embodiment of the invention provides a method and a device for switching a MAC forwarding link, so as to solve the technical problem that the forwarding efficiency is low when the link is faulty.
  • the embodiment of the invention discloses a medium access control MAC forwarding link switching method, which includes:
  • the MAC address of the MAC outbound PW is faulty. If the PW fast reroute FRR is determined, the MAC address is updated. The interface is an alternate link to the PW FRR.
  • the foregoing method further includes:
  • the MAC outbound interface PW does not have a PW FRR, the MAC is deleted.
  • the embodiment of the invention further discloses a medium access control MAC forwarding link switching device, comprising:
  • the determining unit is configured to determine, in the virtual private local area network service VPLS network, that the MAC outbound PW is faulty, and whether the PW fast rerouting FRR exists on the MAC outbound interface PW;
  • the switching unit is configured to update the standby link of the MAC outbound interface to the PW FRR when the determining unit determines that the MAC outbound interface PW has a PW FRR.
  • the foregoing apparatus further includes:
  • the deleting unit is configured to delete the MAC when the determining unit determines that the MAC outbound interface PW does not have a PW FRR.
  • the above device is placed in a user-facing operator network device UPE.
  • the embodiment of the invention discloses a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the above method.
  • the technical solution of the present application determines whether there is an available backup link in the MAC when the PW link is faulty. If yes, the MAC address is not deleted, and the MAC address is directly updated to the backup link, thereby avoiding multicast. (Unknown unicast), improving forwarding efficiency.
  • FIG. 1 is a typical networking diagram of a VPLS PW FRR service in the related art
  • FIG. 3 is a block diagram showing the components of a MAC forwarding link switching apparatus according to an embodiment of the present invention.
  • MAC1 can be deleted instead of MAC1.
  • the outgoing interface of MAC1 is UPW2.
  • the packets sent by CE1 to CE2 can continue to be forwarded unicast on UPE1.
  • an embodiment of the present invention provides a MAC forwarding link switching method, which mainly includes the following operations:
  • the MAC address of the MAC outbound interface is PW FRR
  • the MAC address is not deleted.
  • the MAC address may be deleted according to the related method. At this point, the entire switching process is shown in Figure 2.
  • Step 1 As shown in Figure 1, UPE1, NPE1, NPE2, and NPE3 are used to set up VPLS PW FRR services. NPEs are connected through PWs. UPE1 and NPE1 and NPE2 are connected to PW FRR (UPW1 is the primary link and UPW2 is the backup). link). Users CE1 and CE2 are connected through UPE1 and NPE3.
  • Table 1 shows the PW FRR relationship table on UPE1.
  • the MAC table on UPE1 is shown in Table 2:
  • Table 2 shows the MAC table on UPE1.
  • Step 2 CE1 sends a packet to CE2: the source MAC address is MAC1 and the destination MAC address is MAC2.
  • UPE1 receives the packet from AC1 and queries the MAC entry based on MAC2. As can be seen from Table 2, MAC2 exists and the outgoing interface is UPW1. Therefore, UPE1 unicasts the packet on UPW1.
  • Step 3 When the UPE1 detects the fault of the UPW1 and performs MAC forwarding link switching, the process includes the following operations:
  • step a it is determined whether there is a PW FRR in the UPW1. It can be seen from Table 1 that there is PW FRR in UPW1, so step b is performed;
  • Step b Modify the backup link UPW2 of MAC1 to PW FRR.
  • Table 3 shows the MAC table on UPE1 after forwarding link switching.
  • Step 4 CE1 sends a packet to CE2: the source MAC address is MAC1 and the destination MAC address is MAC2.
  • UPE1 receives the packet from AC1 and queries the MAC entry based on MAC2. As can be seen from Table 3, MAC2 exists and the outgoing interface is UPW2. Therefore, UPE1 unicasts the packet on UPW2.
  • the above procedure can be used to ensure that the packets sent from CE1 to CE2 are always unicast and forwarded without any multicast (unknown unicast).
  • the embodiment of the invention discloses a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the above method.
  • the embodiment provides a media access control MAC forwarding link switching device, which can be placed in the UPE. As shown in FIG. 3, it includes the following units.
  • the judging unit is configured to determine whether the PW FRR exists on the MAC outbound interface PW when the MAC outbound interface PW fails in the VPLS network.
  • the switching unit is configured to update the standby link of the MAC outbound interface to the PW FRR when the determining unit determines that the MAC outbound interface PW has a PW FRR.
  • the foregoing apparatus may further include a deleting unit, configured to delete the MAC when the determining unit determines that the MAC outbound interface PW does not have a PW FRR.
  • the technical solution of the present application determines whether the MAC has an available backup link. If it exists, the MAC address is not deleted, and the MAC address is directly updated to the backup link, thereby avoiding multicast (unknown unicast). Improve forwarding efficiency.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the above technical solution does not delete the MAC when the PW link is faulty, and directly updates the MAC to the backup link, thereby avoiding multicast (unknown unicast) and improving forwarding efficiency.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

一种介质访问控制转发链路切换方法及装置，所述方法包括：在虚拟专用局域网服务VPLS组网中，面向用户的运营商网络设备UPE发现MAC出接口伪线PW发生故障时，若判断所述MAC出接口PW存在PW快速重路由FRR，则更新所述MAC出接口为PW FRR的备用链路。上述技术方案在PW链路故障时，会判断MAC是否存在可用的备份链路，如果存在，则不删除MAC，直接更新MAC到备份链路上，从而避免了组播(未知单播)，提高了转发效率。

Description

一种介质访问控制转发链路切换方法及装置 技术领域
本文涉及但不限于数据通信技术，尤指虚拟专用局域网服务(Virtual Private LAN Service，VPLS)中伪线(PseudoWire，PW)快速重路由(FastReRoute，FRR)下，介质访问控制(Media Access Control，MAC)转发链路切换方法及装置。
背景技术
VPLS实际上是典型的基于多协议标签交换(Multiprotocol Label Switching,MPLS)网络的二层VPN服务，即MPLS L2VPN技术，在运营商网络上通过MPLS技术，使分散在不同地理位置上的用户连接起来。从用户的角度来看，整个MPLS网络是透明的，就如同一个虚拟的二层交换网络。
图1为典型的VPLS PW FRR业务组网。其中面向用户的运营商网络设备(User facing-Provider Edge，UPE)1、面向网络的运营商网络设备(Network Provider Edge,NPE)1、NPE2、NPE3组成运营商网络，向用户边界网络设备(Custom Edge，CE)1、CE2提供VPLS业务。NPE之间需要建立PW全连接，如图1所示，在此文中把NPE之间的PW称之为NPW(面向网络的运营商网络设备之间的伪线)。UPE1分别与NPE1、NPE2建立UPW(面向用户的运营商网络设备之间的伪线)1、UPW2，并且在UPE1上形成PW FRR。其中UPW1为主链路，UPW2为备份链路。CE1和CE2分别通过AC(Access Connection，接入电路)接入到运营商网络。
假设用户CE1的MAC为MAC1，CE2的MAC为MAC2，并且CE1与CE2之间通信。CE2发送报文给CE1(报文的源MAC为MAC2，目的MAC为MAC1)，在UPE1上，同时从UPW1和UPW2收到该报文。UPW2为备份链路，因此报文被丢弃。UPW1为主链路，报文继续处理，通过AC1转发给CE1。同时UPE1学习MAC2，出接口为UPW1。此后，CE1发送给CE2的报文(源MAC为MAC1，目的MAC为MAC2)，在UPE1查询到MAC2 存在，并且出接口为UPW1，因此通过UPW1转发。
当UPE1上的主链路UPW1故障时，VPLS业务会把UPW2切换为主链路。同时由于UPW1故障，其上学习的MAC1也会备删掉。
这样就存在一个问题，CE1发送给CE2的报文，在UPE1上本来是存在MAC2，通过单播转发到CE2的。但是由于发生了链路切换，导致MAC1被删掉，报文只能通过组播(未知单播)来向CE2转发了，降低了转发效率。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供一种MAC转发链路切换方法及装置，以解决链路故障时转发效率低的技术问题。
本发明实施例公开了一种介质访问控制MAC转发链路切换方法，包括：
在虚拟专用局域网服务VPLS组网中，面向用户的运营商网络设备UPE发现MAC出接口伪线PW发生故障时，若判断所述MAC出接口PW存在PW快速重路由FRR，则更新所述MAC出接口为PW FRR的备用链路。
可选地，上述方法还包括：
若判断所述MAC出接口PW不存在PW FRR时，删除所述MAC。
本发明实施例还公开了一种介质访问控制MAC转发链路切换装置，包括：
判断单元，设置为在虚拟专用局域网服务VPLS组网中，MAC出接口伪线PW发生故障时，判断所述MAC出接口PW是否存在PW快速重路由FRR；
切换单元，设置为在所述判断单元判断所述MAC出接口PW存在PW FRR时，更新所述MAC出接口为PW FRR的备用链路。
可选地，上述装置还包括：
删除单元，设置为在所述判断单元判断所述MAC出接口PW不存在PW FRR时，删除所述MAC。
可选地，上述装置置于面向用户的运营商网络设备UPE中。
本发明实施例公开了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述的方法。
与相关技术相比较，本申请技术方案在PW链路故障时，会判断MAC是否存在可用的备份链路，如果存在，则不删除MAC，直接更新MAC到备份链路上，从而避免了组播(未知单播)，提高了转发效率。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是相关技术中的VPLS PW FRR业务典型组网图；
图2是本发明实施例的MAC链路切换流程图；
图3是本发明实施例的MAC转发链路切换装置组成模块图。
本发明的实施方式
下文将结合附图对本申请技术方案作进一步详细说明。需要说明的是，在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。
实施例1
以图1所示的组网为例，MAC1在UPE1上由于UPW1故障而要被删掉时，如果能够识别出UPW1和UPW2是存在PW FRR关系的话，那么就可以不删掉MAC1，而是更新MAC1的出接口为UPW2。这样的话，CE1发送给CE2的报文，在UPE1上可以继续单播转发。
基于上述思想，本发明实施例提供一种MAC转发链路切换方法，主要包括如下操作：
在VPLS组网中，当MAC出接口PW发生故障时，如果判断该MAC出接口PW存在PW FRR关系，不删除该MAC，而是更新MAC出接口到PW  FRR的备份链路；如果判断该MAC出接口PW不存在PW FRR关系，删除MAC。
其中，判断MAC出接口PW不存在PW FRR时，可以按照相关方法删除MAC即可。此时整个切换过程如图2所示。
下面以图1所示的组网为例，说明上述方法的具体实现过程。
步骤一：如图1所示，UPE1、NPE1、NPE2、NPE3搭建VPLS PW FRR业务，其中NPE之间通过PW全连接，UPE1与NPE1、NPE2建了PW FRR(UPW1为主链路，UPW2为备份链路)。用户CE1、CE2通过UPE1、NPE3接入。
此时UPE1上PW FRR表项如表1所示：
表1为UPE1上PW FRR关系表
PW FRR 主链路 备份链路
1 UPW1 UPW2
     
UPE1上MAC表如表2所示：
表2为UPE1上MAC表
MAC 出接口
MAC1 AC1
MAC2 UPW1
步骤二：CE1向CE2发送报文：源MAC为MAC1，目的MAC为MAC2。
UPE1从AC1上收到报文，根据MAC2查询MAC表项。由表2可知，MAC2存在，并且出接口为UPW1。因此UPE1在UPW1上单播发送报文。
步骤三：当UPE1感知到UPW1故障，进行MAC转发链路切换，该过程包括如下操作：
步骤a，判断UPW1是否存在PW FRR。由表1可知，UPW1存在PW FRR，因此执行步骤b；
步骤b：修改MAC1到PW FRR的备份链路UPW2。
经过该步骤，UPE1上MAC表项如表3所示：
表3为转发链路切换后UPE1上MAC表
MAC 出接口
MAC1 AC1
MAC2 UPW2
步骤四：CE1向CE2发送报文：源MAC为MAC1，目的MAC为MAC2。
UPE1从AC1上收到报文，根据MAC2查询MAC表项。由表3可知，MAC2存在，并且出接口为UPW2。因此UPE1在UPW2上单播发送报文。
通过以上步骤可以发现，UPE1上在链路发生切换前后，CE1发向CE2的报文始终进行单播转发，未发生组播(未知单播)的情况，提高了转发效率。
本发明实施例公开了一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行上述的方法。
实施例2
本实施例提供一种介质访问控制MAC转发链路切换装置，可以置于UPE中，如图3所示，其包括如下单元。
判断单元，设置为在VPLS组网中，MAC出接口PW发生故障时，判断MAC出接口PW是否存在PW FRR；
切换单元，设置为在判断单元判断MAC出接口PW存在PW FRR时，更新MAC出接口为PW FRR的备用链路。
另外，上述装置还可以包括删除单元，设置为在判断单元判断MAC出接口PW不存在PW FRR时，删除MAC。
本申请技术方案在PW链路故障时，会判断MAC是否存在可用的备份链路，如果存在，则不删除MAC，直接更新MAC到备份链路上，从而避免了组播(未知单播)，提高了转发效率。
以上内容是结合具体的实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现，所述计算机程序可以存储于一计算机可读存储介质中，所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行，在执行时，包括方法实施例的步骤之一或其组合。
可选地，上述实施例的全部或部分步骤也可以使用集成电路来实现，这些步骤可以被分别制作成一个个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。
上述实施例中的各装置/功能模块/功能单元可以采用通用的计算装置来实现，它们可以集中在单个的计算装置上，也可以分布在多个计算装置所组成的网络上。
上述实施例中的各装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器，磁盘或光盘等。
工业实用性
上述技术方案在PW链路故障时，不删除MAC，直接更新MAC到备份链路上，从而避免了组播(未知单播)，提高了转发效率。

Claims (6)

  1. 一种介质访问控制MAC转发链路切换方法，包括：
    在虚拟专用局域网服务VPLS组网中，面向用户的运营商网络设备UPE发现MAC出接口伪线PW发生故障时，若判断所述MAC出接口PW存在PW快速重路由FRR，则更新所述MAC出接口为PW FRR的备用链路。
  2. 如权利要求1所述的方法，该方法还包括：
    若判断所述MAC出接口PW不存在PW FRR时，删除所述MAC。
  3. 一种介质访问控制MAC转发链路切换装置，包括：
    判断单元，设置为在虚拟专用局域网服务VPLS组网中，MAC出接口伪线PW发生故障时，判断所述MAC出接口PW是否存在PW快速重路由FRR；
    切换单元，设置为在所述判断单元判断所述MAC出接口PW存在PWFRR时，更新所述MAC出接口为PW FRR的备用链路。
  4. 如权利要求3所述的装置，还包括：
    删除单元，设置为在所述判断单元判断所述MAC出接口PW不存在PWFRR时，删除所述MAC。
  5. 如权利要求3或4所述的装置，其中，该装置置于面向用户的运营商网络设备UPE中。
  6. 一种计算机存储介质，所述计算机存储介质中存储有计算机可执行指令，所述计算机可执行指令用于执行权利要求1～2中任一项所述的方法。
PCT/CN2015/089459 2014-11-14 2015-09-11 一种介质访问控制转发链路切换方法及装置 WO2016074529A1 (zh)

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